Tus%25252525252525252525252525252525252525252520qd

## Tus%25252525252525252525252525252525252525252520qd (Tus%25252525252525252525252525252525252525252520qd) ## Overview Tus%25252525252525252525252525252525252525252520qd is a combination product containing dextromethorphan, an antitussive, and guaifenesin, an expectorant. Dextromethorphan acts centrally on the cough center in the medulla. Guaifenesin increases respiratory tract fluid secretions and reduces mucus viscosity, aiding in expectoration. ## Primary Indications * Symptomatic relief of cough associated with the common cold, bronchitis, or other minor respiratory tract irritations. * Helps loosen phlegm and thin bronchial secretions. ## Adult Dosing * **Dextromethorphan:** Typically 10-20 mg every 4 hours, or 30 mg every 6-8 hours. Maximum 120 mg per 24 hours. * **Guaifenesin:** Typically 200-400 mg every 4 hours. Maximum 2400 mg per 24 hours. *Specific dosing for Tus%25252525252525252525252525252525252525252520qd formulations will vary. Refer to the specific product labeling for exact amounts of each component and recommended dosing intervals.* ## Pediatric Dosing * **Dextromethorphan:** * Ages 6 to under 12 years: 5-10 mg every 4 hours, or 15 mg every 6-8 hours. Maximum 60 mg per 24 hours. * Ages 2 to under 6 years: Consult product labeling or pediatrician. Generally not recommended for children under 2 years old. * **Guaifenesin:** * Ages 6 to under 12 years: 100-200 mg every 4 hours. Maximum 1200 mg per 24 hours. * Ages 2 to under 6 years: Consult product labeling or pediatrician. Generally not recommended for children under 2 years old. *Always use pediatric-specific formulations and consult product labeling for precise pediatric dosing. Dosing for children under 6 years old should be guided by a healthcare professional.* ## Dose Adjustments No specific dose adjustments are routinely required for renal or hepatic impairment, but caution is advised. Dextromethorphan is metabolized by CYP2D6; patients with CYP2D6 poor metabolizer status may experience increased effects and toxicity. ## Contraindications * Hypersensitivity to dextromethorphan or guaifenesin. * Use within 14 days of a monoamine oxidase inhibitor (MAOI) or within 14 days of stopping an MAOI. * Use in patients with narrow-angle glaucoma. * Use in patients with significant respiratory impairment (e.g., asthma, COPD) may be cautioned due to potential for increased mucus retention. ## Adverse Effects * **Dextromethorphan:** Dizziness, drowsiness, nausea, vomiting, confusion, hallucinations (rare). Serotonin syndrome may occur with concomitant serotonergic agents. * **Guaifenesin:** Nausea, vomiting, stomach upset. ## Key Drug Interactions * **MAOIs:** Potentially fatal serotonin syndrome or hypertensive crisis. * **Serotonergic Agents (e.g., SSRIs, SNRIs, tricyclic antidepressants, triptans):** Increased risk of serotonin syndrome. * **CNS Depressants (e.g., alcohol, benzodiazepines, opioids):** Additive CNS depression. * **CYP2D6 Inhibitors (e.g., fluoxetine, paroxetine, quinidine):** May increase dextromethorphan plasma concentrations, increasing risk of toxicity. ## Monitoring * Monitor for effectiveness of cough suppression and expectoration. * Assess for adverse effects, especially CNS effects with dextromethorphan. * Monitor for signs of serotonin syndrome if risk factors are present. ## Clinical Pearls * Effectiveness of guaifenesin is controversial; adequate hydration is often as effective for expectoration. * Dextromethorphan has potential for abuse at higher than recommended doses. * Product formulations vary widely; always check the active ingredients and quantities per dose on the specific product label. * This medication is intended for symptomatic relief and does not treat the underlying cause of the cough. **Disclaimer:** This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and institutional guidelines before making any clinical decisions. Dosing and recommendations can change.